Brainiest if correct or first -5/12-(-3/4)
2 answers:
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Answer:
Step-by-step explanation:
In the past, mean of age of employees
i.e.
Recently sample was taken
n = sample size = 60
Mean of sample = 45
Std dev of sample s = 16
(Right tailed test)
Since only population std deviation is known we can use t test only
Std error =
Mean difference = 45-40 =5
Test statistic t=
df = 60
p value =0.008739
Since p < 0.05 we reject null hypothesis
The mean age has increased.
These are called integer numbers.
We start with natural numbers (or whole numbers), i.e. the set
When you add the opposite of each whole number, you have the set of integers: